by John Roach, NBC News
Kelvin Doe’s neighborhood in Sierra Leone has power lines, but they seldom deliver electricity. So, the 16-year-old whiz kid built his own battery out of acid, soda, and metal parts scavenged from trash bins that he now uses to light up area homes and help him work on his own inventions.
Among other gadgets to his credit are a homemade radio transmitter, plus a generato...